bill300D,
That Proto in your photo looks pretty darn close; wide beam, V-gullets, and the head angles look spot on. Funny thing, I've never seen a Proto angle wrench like the one in you photo. I've probably got ten Plomb/Proto angle wrenches that are totally different from yours. They're all pretty thin, have U-gullets, and have totally different head angles.
Do you mind if I share your photos with the guys over at the Garage Gazette? They're going to go nut's when they see your Proto examples. Also, is there a wrench number on your Proto angle wrench?